Material Selection: Use fire-rated cable trays or coatings suitable for the environment. Indoor trays are typically painted steel or galvanized steel, while outdoor or corrosive environments may require stainless steel, aluminum alloy, or fiberglass-reinforced trays. Fireproof coatings like FLAMMOTECT-A or DG-CR 0.7 can enhance flame resistance and protect cables from environmental factors such as UV, moisture, and chemicals (Flamro) . Tray Layout and Clearance: Maintain adequate spacing between cables to prevent heat accumulation. Perforated or wire mesh trays improve airflow, which reduces the risk of overheating and fire spread (Zero Instrument) .
Firestop Pillows: Intumescent fireproof pillows, such as AF BAGS, are designed for vertical cable tray penetrations. They expand under heat to seal gaps, providing up to EI 240 fire resistance. These pillows can be inserted into walls, floors, or sandwich panels without additional framing, and are repositionable for maintenance or modifications (AF Systems) . Firestop Caulks and Mastics: Products like IC 15WB Caulk or 3M Fire Barrier Moldable Putty+ are applied around cable trays at wall or floor penetrations. They are intumescent, halogen-free, and can seal irregular gaps, preventing fire and smoke from passing through openings (Eaton) . Fire-Resistant Backing Plates: For large openings, install a fire-resistant backing plate before applying firestop materials. This ensures a tight seal and prevents voids that could compromise fire containment (AllPCB) . Installation Guidelines:
Regular inspection is critical for vertical cable trays: check for corrosion, deformation, or damage to fireproof coatings. Verify that firestop pillows and caulks remain properly positioned and intact. Scheduled maintenance ensures long-term fire protection and compliance with safety standards (Zero Instrument) .
For vertical cable trays, a combination of fire-rated trays, intumescent pillows, firestop caulks, and coatings provides effective fireproofing. Proper installation, sealing at penetrations, and routine inspection are essential to maintain fire safety, prevent flame propagation, and ensure cable functionality during emergencies.
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